docs: Implement cascading deletion for obsolete TrackedEntities[DHIS2-15066]

[zubaira]

No description provided.

[enricocolasante]

Here we shouldn't show entities that we can fix in the migration, so we should filter out any tracked entity that has an enrollment with a program that has a defined trackedEntityType

[enricocolasante]

I still think we should change this query to not show the entities that will be fixed by the migration

[enricocolasante]

Same here

[enricocolasante]

Suggested change

	##### Deleting invalid trackedenetities
	##### Deleting invalid tracked entities

[enricocolasante]

I still think we should change this query to not show the entities that will be fixed by the migration

[enricocolasante]

Suggested change

	##### Deleting invalid tracked enetities
	##### Deleting invalid tracked entities

[enricocolasante]

Suggested change

	- Completely remove invalid trackedentity record. ([Delete trackedentities](#deleting-invalid-trackedenetities))
	- Completely remove invalid trackedentity record. ([Delete trackedentities](#deleting-invalid-tracked-entities))

[enricocolasante]

Suggested change

	SELECT COUNT(1)
	FROM trackedentity te
	WHERE te.trackedentitytypeid IS NULL
	AND NOT EXISTS (
	SELECT 1
	FROM enrollment e
	WHERE e.trackedentityid = te.trackedentityid
	);
	SELECT COUNT(1)
	FROM trackedentity te
	WHERE te.trackedentitytypeid IS NULL
	AND NOT EXISTS (
	SELECT 1
	FROM enrollment e JOIN program p on e.programid = p.programid
	WHERE e.trackedentityid = te.trackedentityid and p.trackedentitytypeid IS NOT NULL
	);

[enricocolasante]

Suggested change

	SELECT COUNT(1)
	FROM trackedentityinstance te
	WHERE te.trackedentitytypeid IS NULL
	AND NOT EXISTS (
	SELECT 1
	FROM programinstance pi
	WHERE pi.trackedentityinstanceid = te.trackedentityinstanceid
	);
	SELECT COUNT(1)
	FROM trackedentityinstance te
	WHERE te.trackedentitytypeid IS NULL
	AND NOT EXISTS (
	SELECT 1
	FROM programinstance pi JOIN program p ON pi.programid = p.programid
	WHERE pi.trackedentityinstanceid = te.trackedentityinstanceid and p.trackedentitytypeid IS NOT NULL
	);

[enricocolasante]

This query is changing all the trackedEntities with null tracked entity type at once.
Can we change the count queries to return the tracked entity uids to be fixed instead of just a count?
And then add them here as a parameter, like AND trackedentityid IN ({uids})?

[enricocolasante]

Suggested change

	SELECT 1
	FROM enrollment
	WHERE enrollment.trackedentityid = trackedentity.trackedentityid
	SELECT 1
	FROM enrollment e JOIN program p on e.programid = p.programid
	WHERE e.trackedentityid = te.trackedentityid and p.trackedentitytypeid IS NOT NULL